Fast implementation of large erosions and dilations in Mamba

Algorithmic description of the implementation of fast morphological operators with large structuring elements.This document explains how to implement fast erosions and dilations when large structuring elements are needed. These structuring elements can be squares, hexagons, octogons or dodecagons. This implementation, realized in the Mamba library brings a dramatic increase of the computation speed. This increase is all the more important as the size of the structuring element is large